build(deps): bump certifi in /tests/opentelemetry-docker-tests/tests

Bumps [certifi](https://github.com/certifi/python-certifi) from 2024.2.2 to 2024.7.4.
- [Commits](certifi/python-certifi@2024.02.02...2024.07.04)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

tests/opentelemetry-docker-tests/tests/test-requirements.txt

@@ -7,7 +7,7 @@ attrs==23.2.0
 bcrypt==4.1.2
 billiard==4.2.0
 celery==5.3.6
-certifi==2024.2.2
+certifi==2024.7.4
 cffi==1.16.0
 chardet==3.0.4
 click==8.1.7